Helicobacter pylori in gastric cancer: Features of infection and their correlations with long-term results of treatment

Abstract

BACKGROUND Helicobacter pylori ( H. pylori ) is a spiral-shaped bacterium responsible for the development of chronic gastritis, gastric ulcer, gastric cancer (GC), and MALT-lymphoma of the stomach. H. pylori can be present in the gastric mucosa (GM) in both spiral and coccoid forms. However, it is not known whether the severity of GM contamination by various vegetative forms of H. pylori is associated with clinical and morphological characteristics and long-term results of GC treatment. AIM To establish the features of H. pylori infection in patients with GC and their correlations with clinical and morphological characteristics of diseases and long-term results of treatment. METHODS Of 109 patients with GC were included in a prospective cohort study. H. pylori in the GM and tumor was determined by rapid urease test and by immunohistochemically using the antibody to H. pylori . The results obtained were compared with the clinical and morphological characteristics and prognosis of GC. Statistical analysis was performed using the Statistica 10.0 software. RESULTS H. pylori was detected in the adjacent to the tumor GM in 84.5% of cases, of which a high degree of contamination was noted in 50.4% of the samples. Coccoid forms of H. pylori were detected in 93.4% of infected patients, and only coccoid-in 68.9%. It was found that a high degree of GM contamination by the coccoid forms of H. pylori was observed significantly more often in diffuse type of GC ( P = 0.024), in poorly differentiated GC ( P = 0.011), in stage T3-4 ( P = 0.04) and in N1 ( P = 0.011). In cases of moderate and marked concentrations of H. pylori in GM, a decrease in 10-year relapse free and overall survival from 55.6% to 26.3% was observed ( P = 0.02 and P = 0.07, respectively). The relationship between the severity of the GM contamination by the spiral-shaped forms of H. pylori and the clinical and morphological characteristics and prognosis of GC was not revealed. CONCLUSION The data obtained indicates that H. pylori may be associated not only with induction but also with the progression of GC.

Effects of helicobacter pylori on tumor microenvironment and immunotherapy responses

“…Helicobacter pylori is a class I carcinogen associated with GC ( 170 – 172 ). The overall survival of GC diagnosis is reported to be higher for patients with H. pylori infection ( 17 ).…”

Clinical Effect, Analysis of Amoxicillin Clavulanate Potassium Combined with Shenling Baizhu Powder in the Treatment of Gastric Ulcer with Helicobacter pylori Infection

“…Studies have indicated that oral administration of Shenling Baizhu powder could reduce bacterial colony forming units in gastric ulcer caused by gastric acid by about 30 % [16] . The extracts of some traditional Chinese medicines have anti-inflammatory activity and can inhibit myeloperoxidase activity at the site of gastric ulcer.…”

Matrix Metalloproteinases in Helicobacter pylori–Associated Gastritis and Gastric Cancer

“…Chronic gastritis can progress sequentially to atrophic gastritis, when a loss of appropriate glands takes place; to intestinal metaplasia, when gastric mucosa further acquires intestinal features; to neoplastic stage without invasion, called dysplasia; and, finally, to gastric cancer [12,13]. A progression of gastric cancer might also be associated with H. pylori infection [14]. In a group of patients, infection with virulent H. pylori strains contributed to the development of gastric ulcer disease and MALT (mucosaassociated lymphoid tissue) lymphoma.…”